2 * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/_types.h>
35 #define __fenv_static static
38 typedef __uint32_t fenv_t;
39 typedef __uint32_t fexcept_t;
42 #ifdef __mips_soft_float
43 #define _FPUSW_SHIFT 16
44 #define FE_INVALID 0x0001
45 #define FE_DIVBYZERO 0x0002
46 #define FE_OVERFLOW 0x0004
47 #define FE_UNDERFLOW 0x0008
48 #define FE_INEXACT 0x0010
50 #define _FCSR_CAUSE_SHIFT 10
51 #define FE_INVALID 0x0040
52 #define FE_DIVBYZERO 0x0020
53 #define FE_OVERFLOW 0x0010
54 #define FE_UNDERFLOW 0x0008
55 #define FE_INEXACT 0x0004
57 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
58 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
61 #define FE_TONEAREST 0x0000
62 #define FE_TOWARDZERO 0x0001
63 #define FE_UPWARD 0x0002
64 #define FE_DOWNWARD 0x0003
65 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
66 FE_UPWARD | FE_TOWARDZERO)
69 /* Default floating-point environment */
70 extern const fenv_t __fe_dfl_env;
71 #define FE_DFL_ENV (&__fe_dfl_env)
73 /* We need to be able to map status flag positions to mask flag positions */
74 #define _ENABLE_SHIFT 5
75 #define _ENABLE_MASK (FE_ALL_EXCEPT << _ENABLE_SHIFT)
77 #if !defined(__mips_soft_float) && !defined(__mips_hard_float)
78 #error compiler didnt set soft/hard float macros
81 #ifndef __mips_soft_float
82 #define __cfc1(__fcsr) __asm __volatile("cfc1 %0, $31" : "=r" (__fcsr))
83 #define __ctc1(__fcsr) __asm __volatile("ctc1 %0, $31" :: "r" (__fcsr))
86 #ifdef __mips_soft_float
87 int feclearexcept(int __excepts);
88 int fegetexceptflag(fexcept_t *__flagp, int __excepts);
89 int fesetexceptflag(const fexcept_t *__flagp, int __excepts);
90 int feraiseexcept(int __excepts);
91 int fetestexcept(int __excepts);
93 int fesetround(int __round);
94 int fegetenv(fenv_t *__envp);
95 int feholdexcept(fenv_t *__envp);
96 int fesetenv(const fenv_t *__envp);
97 int feupdateenv(const fenv_t *__envp);
99 __fenv_static inline int
100 feclearexcept(int __excepts)
104 __excepts &= FE_ALL_EXCEPT;
106 fcsr &= ~(__excepts | (__excepts << _FCSR_CAUSE_SHIFT));
112 __fenv_static inline int
113 fegetexceptflag(fexcept_t *__flagp, int __excepts)
117 __excepts &= FE_ALL_EXCEPT;
119 *__flagp = fcsr & __excepts;
124 __fenv_static inline int
125 fesetexceptflag(const fexcept_t *__flagp, int __excepts)
129 __excepts &= FE_ALL_EXCEPT;
132 fcsr |= *__flagp & __excepts;
138 __fenv_static inline int
139 feraiseexcept(int __excepts)
143 __excepts &= FE_ALL_EXCEPT;
145 fcsr |= __excepts | (__excepts << _FCSR_CAUSE_SHIFT);
151 __fenv_static inline int
152 fetestexcept(int __excepts)
156 __excepts &= FE_ALL_EXCEPT;
159 return (fcsr & __excepts);
162 __fenv_static inline int
169 return (fcsr & _ROUND_MASK);
172 __fenv_static inline int
173 fesetround(int __round)
177 if (__round & ~_ROUND_MASK)
181 fcsr &= ~_ROUND_MASK;
188 __fenv_static inline int
189 fegetenv(fenv_t *__envp)
197 __fenv_static inline int
198 feholdexcept(fenv_t *__envp)
204 fcsr &= ~(FE_ALL_EXCEPT | _ENABLE_MASK);
210 __fenv_static inline int
211 fesetenv(const fenv_t *__envp)
219 __fenv_static inline int
220 feupdateenv(const fenv_t *__envp)
230 #endif /* !__mips_soft_float */
234 /* We currently provide no external definitions of the functions below. */
236 #ifdef __mips_soft_float
237 int feenableexcept(int __mask);
238 int fedisableexcept(int __mask);
239 int fegetexcept(void);
242 feenableexcept(int __mask)
244 fenv_t __old_fcsr, __new_fcsr;
247 __new_fcsr = __old_fcsr | (__mask & FE_ALL_EXCEPT) << _ENABLE_SHIFT;
250 return ((__old_fcsr >> _ENABLE_SHIFT) & FE_ALL_EXCEPT);
254 fedisableexcept(int __mask)
256 fenv_t __old_fcsr, __new_fcsr;
259 __new_fcsr = __old_fcsr & ~((__mask & FE_ALL_EXCEPT) << _ENABLE_SHIFT);
262 return ((__old_fcsr >> _ENABLE_SHIFT) & FE_ALL_EXCEPT);
272 return ((fcsr & _ENABLE_MASK) >> _ENABLE_SHIFT);
275 #endif /* !__mips_soft_float */
277 #endif /* __BSD_VISIBLE */
281 #endif /* !_FENV_H_ */